Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:85:36: error: invalid conversion from ‘int (*)(entry, entry)’ to ‘__compar_fn_t {aka int (*)(const void*, const void*)}’ [-fpermissive] qsort(A, n, sizeof(entry), cmpp); ^ In file included from /usr/include/c++/4.8/cstdlib:72:0, from /usr/include/c++/4.8/bits/stl_algo.h:59, from /usr/include/c++/4.8/algorithm:62, from user.cpp:1: /usr/include/stdlib.h:761:13: error: initializing argument 4 of ‘void qsort(void*, size_t, size_t, __compar_fn_t)’ [-fpermissive] extern void qsort (void *__base, size_t __nmemb, size_t __size, ^ user.cpp:69:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &N); ^ user.cpp:72:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d %d", &x1, &y1, &x2, &y2); ^